Abstract: A storage box assembly for a truck cargo compartment with sidewalls and a bottom. A pair of storage boxes (54, 56) are mounted on a frame (12) for lateral movement towards and away from each other (FIG. 3). Vertically adjustable columns (22) are provided at the corners of the frame (12). They are fitable within the storage compartment (FIG. 3) and are adapted for raising and lowering the frame (12) to move the frame (12) between a lowered position (FIG. 1) and a raised position (FIG. 2). When the frame (12) is in its lowered position the storage boxes (54, 56) are down within the cargo compartment. When the frame (12) is in its raised position the storage boxes (54, 56) are elevated above the bottom (32) of the cargo compartment. The storage boxes (54, 56) are adapted to moved laterally inwardly towards each other, so that when the frame (12) is in its lowered position (FIG. 1), the storage boxes (54, 56) can be placed between the sides (36, 38) of the cargo compartment.